Pond filter



FIG. 1 is a right side view of the pond filter showing our new design;

FIG. 2 is a top perspective view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is an underside view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is plan view thereof. 

We claim the ornamental design for a pond filter, as shown. 